Improvement and Assessment of Gaofen-3 Spotlight Mode 3-D Localization Accuracy

The spotlight image acquired by the Gaofen-3 satellite has a resolution of 1 m, which great potential for 3-D localization. However, there have been no public reports on localization accuracy evaluation synthetic aperture radar (SAR) images. Here, three study areas were selected from this perspective, and SAR stereo images area using Gaofen-3. In case ground control points (GCPs), based Rational Polynomial Coefficient (RPC) model, these used initial localization; plane was better than 10 m in general, elevation worse 37 general. Subsequently, RPC model optimized geometric calibration technology, assessed again. significantly improved, generally 5 m. plan also it 6 It can be seen that are good quality, high obtained even without GCPs. Geometric technology improves accuracy, optimization effect is remarkable. Moreover, affected properties stereo-image pairs. obvious asymmetric pairs, general symmetric